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#include "config.h"
#include <cassert>
#include <fstream>
#include <unordered_set>
#include <unordered_map>
#include <typeinfo>
#include <sys/stat.h>
#include "logger.hh"
#include "logging.hh"
#include "iputils.hh"
#include "dnsname.hh"
#include "dnsparser.hh"
#include "dnspacket.hh"
#include "namespaces.hh"
#include "ednssubnet.hh"
#include "lua-base4.hh"
#include "ext/luawrapper/include/LuaContext.hpp"
#include "dns_random.hh"
void BaseLua4::loadFile(const std::string& fname, bool doPostLoad)
{
std::ifstream ifs(fname);
if (!ifs) {
auto ret = errno;
auto msg = stringerror(ret);
g_log << Logger::Error << "Unable to read configuration file from '" << fname << "': " << msg << endl;
throw std::runtime_error(msg);
}
loadStream(ifs, doPostLoad);
};
void BaseLua4::loadString(const std::string &script) {
std::istringstream iss(script);
loadStream(iss, true);
};
void BaseLua4::includePath(const std::string& directory) {
std::vector<std::string> vec;
const std::string& suffix = "lua";
auto directoryError = pdns::visit_directory(directory, [this, &directory, &suffix, &vec]([[maybe_unused]] ino_t inodeNumber, const std::string_view& name) {
(void)this;
if (boost::starts_with(name, ".")) {
return true; // skip any dots
}
if (boost::ends_with(name, suffix)) {
// build name
string fullName = directory + "/" + std::string(name);
// ensure it's readable file
struct stat statInfo
{
};
if (stat(fullName.c_str(), &statInfo) != 0 || !S_ISREG(statInfo.st_mode)) {
string msg = fullName + " is not a regular file";
g_log << Logger::Error << msg << std::endl;
throw PDNSException(std::move(msg));
}
vec.emplace_back(fullName);
}
return true;
});
if (directoryError) {
int err = errno;
string msg = directory + " is not accessible: " + stringerror(err);
g_log << Logger::Error << msg << std::endl;
throw PDNSException(std::move(msg));
}
std::sort(vec.begin(), vec.end(), CIStringComparePOSIX());
for(const auto& file: vec) {
loadFile(file, false);
}
};
// By default no features
void BaseLua4::getFeatures(Features &) { }
void BaseLua4::prepareContext() {
d_lw = std::make_unique<LuaContext>();
// lua features available
Features features;
getFeatures(features);
d_lw->writeVariable("pdns_features", features);
// dnsheader
d_lw->registerFunction<int(dnsheader::*)()>("getID", [](dnsheader& dh) { return ntohs(dh.id); });
d_lw->registerFunction<bool(dnsheader::*)()>("getCD", [](dnsheader& dh) { return dh.cd; });
d_lw->registerFunction<bool(dnsheader::*)()>("getTC", [](dnsheader& dh) { return dh.tc; });
d_lw->registerFunction<bool(dnsheader::*)()>("getRA", [](dnsheader& dh) { return dh.ra; });
d_lw->registerFunction<bool(dnsheader::*)()>("getAD", [](dnsheader& dh) { return dh.ad; });
d_lw->registerFunction<bool(dnsheader::*)()>("getAA", [](dnsheader& dh) { return dh.aa; });
d_lw->registerFunction<bool(dnsheader::*)()>("getRD", [](dnsheader& dh) { return dh.rd; });
d_lw->registerFunction<int(dnsheader::*)()>("getRCODE", [](dnsheader& dh) { return dh.rcode; });
d_lw->registerFunction<int(dnsheader::*)()>("getOPCODE", [](dnsheader& dh) { return dh.opcode; });
d_lw->registerFunction<int(dnsheader::*)()>("getQDCOUNT", [](dnsheader& dh) { return ntohs(dh.qdcount); });
d_lw->registerFunction<int(dnsheader::*)()>("getANCOUNT", [](dnsheader& dh) { return ntohs(dh.ancount); });
d_lw->registerFunction<int(dnsheader::*)()>("getNSCOUNT", [](dnsheader& dh) { return ntohs(dh.nscount); });
d_lw->registerFunction<int(dnsheader::*)()>("getARCOUNT", [](dnsheader& dh) { return ntohs(dh.arcount); });
// DNSName
d_lw->writeFunction("newDN", [](const std::string& dom){ return DNSName(dom); });
d_lw->registerFunction("__lt", &DNSName::operator<);
d_lw->registerFunction("canonCompare", &DNSName::canonCompare);
d_lw->registerFunction<DNSName(DNSName::*)(const DNSName&)>("makeRelative", [](const DNSName& name, const DNSName& zone) { return name.makeRelative(zone); });
d_lw->registerFunction<bool(DNSName::*)(const DNSName&)>("isPartOf", [](const DNSName& name, const DNSName& rhs) { return name.isPartOf(rhs); });
d_lw->registerFunction("getRawLabels", &DNSName::getRawLabels);
d_lw->registerFunction<unsigned int(DNSName::*)()>("countLabels", [](const DNSName& name) { return name.countLabels(); });
d_lw->registerFunction<size_t(DNSName::*)()>("wireLength", [](const DNSName& name) { return name.wirelength(); });
d_lw->registerFunction<size_t(DNSName::*)()>("wirelength", [](const DNSName& name) { return name.wirelength(); });
d_lw->registerFunction<bool(DNSName::*)(const std::string&)>("equal", [](const DNSName& lhs, const std::string& rhs) { return lhs==DNSName(rhs); });
d_lw->registerEqFunction(&DNSName::operator==);
d_lw->registerToStringFunction<string(DNSName::*)()>([](const DNSName&dn ) { return dn.toString(); });
d_lw->registerFunction<string(DNSName::*)()>("toString", [](const DNSName&dn ) { return dn.toString(); });
d_lw->registerFunction<string(DNSName::*)()>("toStringNoDot", [](const DNSName&dn ) { return dn.toStringNoDot(); });
d_lw->registerFunction<bool(DNSName::*)()>("chopOff", [](DNSName&dn ) { return dn.chopOff(); });
// DNSResourceRecord
d_lw->writeFunction("newDRR", [](const DNSName& qname, const string& qtype, const unsigned int ttl, const string& content, boost::optional<int> domain_id, boost::optional<int> auth){
auto drr = DNSResourceRecord();
drr.qname = qname;
drr.qtype = qtype;
drr.ttl = ttl;
drr.setContent(content);
if (domain_id)
drr.domain_id = *domain_id;
if (auth)
drr.auth = *auth;
return drr;
});
d_lw->registerEqFunction(&DNSResourceRecord::operator==);
d_lw->registerFunction("__lt", &DNSResourceRecord::operator<);
d_lw->registerToStringFunction<string(DNSResourceRecord::*)()>([](const DNSResourceRecord& rec) { return rec.getZoneRepresentation(); });
d_lw->registerFunction<string(DNSResourceRecord::*)()>("toString", [](const DNSResourceRecord& rec) { return rec.getZoneRepresentation();} );
d_lw->registerFunction<DNSName(DNSResourceRecord::*)()>("qname", [](DNSResourceRecord& rec) { return rec.qname; });
d_lw->registerFunction<DNSName(DNSResourceRecord::*)()>("wildcardName", [](DNSResourceRecord& rec) { return rec.wildcardname; });
d_lw->registerFunction<string(DNSResourceRecord::*)()>("content", [](DNSResourceRecord& rec) { return rec.content; });
d_lw->registerFunction<time_t(DNSResourceRecord::*)()>("lastModified", [](DNSResourceRecord& rec) { return rec.last_modified; });
d_lw->registerFunction<uint32_t(DNSResourceRecord::*)()>("ttl", [](DNSResourceRecord& rec) { return rec.ttl; });
d_lw->registerFunction<uint32_t(DNSResourceRecord::*)()>("signttl", [](DNSResourceRecord& rec) { return rec.signttl; });
d_lw->registerFunction<int(DNSResourceRecord::*)()>("domainId", [](DNSResourceRecord& rec) { return rec.domain_id; });
d_lw->registerFunction<uint16_t(DNSResourceRecord::*)()>("qtype", [](DNSResourceRecord& rec) { return rec.qtype.getCode(); });
d_lw->registerFunction<uint16_t(DNSResourceRecord::*)()>("qclass", [](DNSResourceRecord& rec) { return rec.qclass; });
d_lw->registerFunction<uint8_t(DNSResourceRecord::*)()>("scopeMask", [](DNSResourceRecord& rec) { return rec.scopeMask; });
d_lw->registerFunction<bool(DNSResourceRecord::*)()>("auth", [](DNSResourceRecord& rec) { return rec.auth; });
d_lw->registerFunction<bool(DNSResourceRecord::*)()>("disabled", [](DNSResourceRecord& rec) { return rec.disabled; });
// ComboAddress
d_lw->registerFunction<bool(ComboAddress::*)()>("isIPv4", [](const ComboAddress& addr) { return addr.sin4.sin_family == AF_INET; });
d_lw->registerFunction<bool(ComboAddress::*)()>("isIPv6", [](const ComboAddress& addr) { return addr.sin4.sin_family == AF_INET6; });
d_lw->registerFunction<uint16_t(ComboAddress::*)()>("getPort", [](const ComboAddress& addr) { return ntohs(addr.sin4.sin_port); } );
d_lw->registerFunction<bool(ComboAddress::*)()>("isMappedIPv4", [](const ComboAddress& addr) { return addr.isMappedIPv4(); });
d_lw->registerFunction<ComboAddress(ComboAddress::*)()>("mapToIPv4", [](const ComboAddress& addr) { return addr.mapToIPv4(); });
d_lw->registerFunction<void(ComboAddress::*)(unsigned int)>("truncate", [](ComboAddress& addr, unsigned int bits) { addr.truncate(bits); });
d_lw->registerFunction<string(ComboAddress::*)()>("toString", [](const ComboAddress& addr) { return addr.toString(); });
d_lw->registerToStringFunction<string(ComboAddress::*)()>([](const ComboAddress& addr) { return addr.toString(); });
d_lw->registerFunction<string(ComboAddress::*)()>("toStringWithPort", [](const ComboAddress& addr) { return addr.toStringWithPort(); });
d_lw->registerFunction<string(ComboAddress::*)()>("getRaw", [](const ComboAddress& addr) { return addr.toByteString(); });
d_lw->writeFunction("newCA", [](const std::string& a) { return ComboAddress(a); });
d_lw->writeFunction("newCAFromRaw", [](const std::string& raw, boost::optional<uint16_t> port) {
if (raw.size() == 4) {
struct sockaddr_in sin4;
memset(&sin4, 0, sizeof(sin4));
sin4.sin_family = AF_INET;
memcpy(&sin4.sin_addr.s_addr, raw.c_str(), raw.size());
if (port) {
sin4.sin_port = htons(*port);
}
return ComboAddress(&sin4);
}
else if (raw.size() == 16) {
struct sockaddr_in6 sin6;
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_family = AF_INET6;
memcpy(&sin6.sin6_addr.s6_addr, raw.c_str(), raw.size());
if (port) {
sin6.sin6_port = htons(*port);
}
return ComboAddress(&sin6);
}
return ComboAddress();
});
typedef std::unordered_set<ComboAddress,ComboAddress::addressOnlyHash,ComboAddress::addressOnlyEqual> cas_t;
d_lw->registerFunction<bool(ComboAddress::*)(const ComboAddress&)>("equal", [](const ComboAddress& lhs, const ComboAddress& rhs) { return ComboAddress::addressOnlyEqual()(lhs, rhs); });
// cas_t
d_lw->writeFunction("newCAS", []{ return cas_t(); });
d_lw->registerFunction<void(cas_t::*)(boost::variant<string,ComboAddress, vector<pair<unsigned int,string> > >)>("add",
[](cas_t& cas, const boost::variant<string,ComboAddress,vector<pair<unsigned int,string> > >& in)
{
try {
if(auto s = boost::get<string>(&in)) {
cas.insert(ComboAddress(*s));
}
else if(auto v = boost::get<vector<pair<unsigned int, string> > >(&in)) {
for(const auto& str : *v)
cas.insert(ComboAddress(str.second));
}
else
cas.insert(boost::get<ComboAddress>(in));
}
catch(std::exception& e) {
SLOG(g_log <<Logger::Error<<e.what()<<endl,
g_slog->withName("lua")->error(Logr::Error, e.what(), "Exception in newCAS", "exception", Logging::Loggable("std::exception")));
}
});
d_lw->registerFunction<bool(cas_t::*)(const ComboAddress&)>("check",[](const cas_t& cas, const ComboAddress&ca) { return cas.count(ca)>0; });
// QType
d_lw->writeFunction("newQType", [](const string& s) { QType q; q = s; return q; });
d_lw->registerFunction("getCode", &QType::getCode);
d_lw->registerFunction("getName", &QType::toString);
d_lw->registerEqFunction<bool(QType::*)(const QType&)>([](const QType& a, const QType& b){ return a == b;}); // operator overloading confuses LuaContext
d_lw->registerToStringFunction(&QType::toString);
// Netmask
d_lw->writeFunction("newNetmask", [](const string& s) { return Netmask(s); });
d_lw->registerFunction<ComboAddress(Netmask::*)()>("getNetwork", [](const Netmask& nm) { return nm.getNetwork(); } ); // const reference makes this necessary
d_lw->registerFunction<ComboAddress(Netmask::*)()>("getMaskedNetwork", [](const Netmask& nm) { return nm.getMaskedNetwork(); } );
d_lw->registerFunction("isIpv4", &Netmask::isIPv4);
d_lw->registerFunction("isIPv4", &Netmask::isIPv4);
d_lw->registerFunction("isIpv6", &Netmask::isIPv6);
d_lw->registerFunction("isIPv6", &Netmask::isIPv6);
d_lw->registerFunction("getBits", &Netmask::getBits);
d_lw->registerFunction("toString", &Netmask::toString);
d_lw->registerFunction("empty", &Netmask::empty);
d_lw->registerFunction("match", (bool (Netmask::*)(const string&) const)&Netmask::match);
d_lw->registerEqFunction(&Netmask::operator==);
d_lw->registerToStringFunction(&Netmask::toString);
// NetmaskGroup
d_lw->writeFunction("newNMG", [](boost::optional<vector<pair<unsigned int, std::string>>> masks) {
auto nmg = NetmaskGroup();
if (masks) {
for(const auto& mask: *masks) {
nmg.addMask(mask.second);
}
}
return nmg;
});
// d_lw->writeFunction("newNMG", []() { return NetmaskGroup(); });
d_lw->registerFunction<void(NetmaskGroup::*)(const std::string&mask)>("addMask", [](NetmaskGroup&nmg, const std::string& mask) { nmg.addMask(mask); });
d_lw->registerFunction<void(NetmaskGroup::*)(const vector<pair<unsigned int, std::string>>&)>("addMasks", [](NetmaskGroup&nmg, const vector<pair<unsigned int, std::string>>& masks) { for(const auto& mask: masks) { nmg.addMask(mask.second); } });
d_lw->registerFunction("match", (bool (NetmaskGroup::*)(const ComboAddress&) const)&NetmaskGroup::match);
// DNSRecord
d_lw->writeFunction("newDR", [](const DNSName& name, const std::string& type, unsigned int ttl, const std::string& content, int place) { QType qtype; qtype = type; auto dr = DNSRecord(); dr.d_name = name; dr.d_type = qtype.getCode(); dr.d_ttl = ttl; dr.setContent(shared_ptr<DNSRecordContent>(DNSRecordContent::make(dr.d_type, QClass::IN, content))); dr.d_place = static_cast<DNSResourceRecord::Place>(place); return dr; });
d_lw->registerMember("name", &DNSRecord::d_name);
d_lw->registerMember("type", &DNSRecord::d_type);
d_lw->registerMember("ttl", &DNSRecord::d_ttl);
d_lw->registerMember("place", &DNSRecord::d_place);
d_lw->registerFunction<string(DNSRecord::*)()>("getContent", [](const DNSRecord& dr) { return dr.getContent()->getZoneRepresentation(); });
d_lw->registerFunction<boost::optional<ComboAddress>(DNSRecord::*)()>("getCA", [](const DNSRecord& dr) {
boost::optional<ComboAddress> ret;
if(auto arec = getRR<ARecordContent>(dr))
ret=arec->getCA(53);
else if(auto aaaarec = getRR<AAAARecordContent>(dr))
ret=aaaarec->getCA(53);
return ret;
});
d_lw->registerFunction<void (DNSRecord::*)(const std::string&)>("changeContent", [](DNSRecord& dr, const std::string& newContent) { dr.setContent(shared_ptr<DNSRecordContent>(DNSRecordContent::make(dr.d_type, 1, newContent))); });
// pdnslog
#ifdef RECURSOR
d_lw->writeFunction("pdnslog", [](const std::string& msg, boost::optional<int> loglevel, boost::optional<std::map<std::string, std::string>> values) {
auto log = g_slog->withName("lua");
if (values) {
for (const auto& [key, value] : *values) {
log = log->withValues(key, Logging::Loggable(value));
}
}
log->info(static_cast<Logr::Priority>(loglevel.get_value_or(Logr::Warning)), msg);
#else
d_lw->writeFunction("pdnslog", [](const std::string& msg, boost::optional<int> loglevel) {
g_log << (Logger::Urgency)loglevel.get_value_or(Logger::Warning) << msg<<endl;
#endif
});
d_lw->writeFunction("pdnsrandom", [](boost::optional<uint32_t> maximum) {
return maximum ? dns_random(*maximum) : dns_random_uint32();
});
// certain constants
vector<pair<string, int> > rcodes = {{"NOERROR", RCode::NoError },
{"FORMERR", RCode::FormErr },
{"SERVFAIL", RCode::ServFail },
{"NXDOMAIN", RCode::NXDomain },
{"NOTIMP", RCode::NotImp },
{"REFUSED", RCode::Refused },
{"YXDOMAIN", RCode::YXDomain },
{"YXRRSET", RCode::YXRRSet },
{"NXRRSET", RCode::NXRRSet },
{"NOTAUTH", RCode::NotAuth },
{"NOTZONE", RCode::NotZone },
{"DROP", -2 }}; // To give backport-incompatibility warning
for(const auto& rcode : rcodes)
d_pd.push_back({rcode.first, rcode.second});
d_pd.push_back({"place", in_t{
{"QUESTION", 0},
{"ANSWER", 1},
{"AUTHORITY", 2},
{"ADDITIONAL", 3}
}});
d_pd.push_back({"loglevels", in_t{
{"Alert", LOG_ALERT},
{"Critical", LOG_CRIT},
{"Debug", LOG_DEBUG},
{"Emergency", LOG_EMERG},
{"Info", LOG_INFO},
{"Notice", LOG_NOTICE},
{"Warning", LOG_WARNING},
{"Error", LOG_ERR}
}});
for(const auto& n : QType::names)
d_pd.push_back({n.first, n.second});
d_lw->registerMember("tv_sec", &timeval::tv_sec);
d_lw->registerMember("tv_usec", &timeval::tv_usec);
postPrepareContext();
// so we can let postprepare do changes to this
d_lw->writeVariable("pdns", d_pd);
}
void BaseLua4::loadStream(std::istream &stream, bool doPostLoad) {
d_lw->executeCode(stream);
if (doPostLoad) {
postLoad();
}
}
BaseLua4::~BaseLua4() = default;
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